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llvm-project/llvm/test/Transforms/Scalarizer/cache-bug.ll

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Prevent the scalarizer from caching incorrect entries The scalarizer can cache incorrect entries when walking up a chain of insertelement instructions. This occurs when it encounters more than one instruction that it is not actively searching for, as it unconditionally caches every element it finds. The fix is to only cache the first element that it isn't searching for so we don't overwrite correct entries. Reviewers: hfinkel Differential Revision: http://reviews.llvm.org/D11559 llvm-svn: 244448
2015-08-10 22:48:47 +08:00
; RUN: opt -scalarizer -S < %s | FileCheck %s
[PM] Port Scalarizer to the new pass manager. Patch by: markus (Markus Lavin) Reviewers: chandlerc, fedor.sergeev Reviewed By: fedor.sergeev Subscribers: llvm-commits, Ka-Ka, bjope Differential Revision: https://reviews.llvm.org/D54695 llvm-svn: 347392
2018-11-21 22:00:17 +08:00
; RUN: opt -passes='function(scalarizer)' -S < %s | FileCheck %s
Prevent the scalarizer from caching incorrect entries The scalarizer can cache incorrect entries when walking up a chain of insertelement instructions. This occurs when it encounters more than one instruction that it is not actively searching for, as it unconditionally caches every element it finds. The fix is to only cache the first element that it isn't searching for so we don't overwrite correct entries. Reviewers: hfinkel Differential Revision: http://reviews.llvm.org/D11559 llvm-svn: 244448
2015-08-10 22:48:47 +08:00
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
; Check that vector element 1 is scalarized correctly from a chain of
; insertelement instructions
define void @func(i32 %x) {
; CHECK-LABEL: @func(
; CHECK-NOT: phi i32 [ %x, %entry ], [ %inc.pos.y, %loop ]
; CHECK: phi i32 [ %inc, %entry ], [ %inc.pos.y, %loop ]
; CHECK: ret void
entry:
%vecinit = insertelement <2 x i32> <i32 0, i32 0>, i32 %x, i32 1
%inc = add i32 %x, 1
%0 = insertelement <2 x i32> %vecinit, i32 %inc, i32 1
br label %loop
loop:
%pos = phi <2 x i32> [ %0, %entry ], [ %new.pos.y, %loop ]
%i = phi i32 [ 0, %entry ], [ %new.i, %loop ]
%pos.y = extractelement <2 x i32> %pos, i32 1
%inc.pos.y = add i32 %pos.y, 1
%new.pos.y = insertelement <2 x i32> %pos, i32 %inc.pos.y, i32 1
%new.i = add i32 %i, 1
%cmp2 = icmp slt i32 %new.i, 1
br i1 %cmp2, label %loop, label %exit
exit:
ret void
}